如何要求用户从字符串中选择一个单词

Question

如何让用户（输入）从句子/字符串中选择一个单词，然后使用python 3.4.3打印所选单词所在的位置

Answer 1

>>> foo = 'This is a sentence'
>>> foo
'This is a sentence'
>>> choice = input('Choose a word from the sentence ' )
Choose a word from the sentence is
>>> foo = foo.split()
>>> foo
['This', 'is', 'a', 'sentence']
>>> if choice in foo:
...     print(foo.index(choice))
...
1
>>>

从列表切换回字符串

>>> foo = ' '.join(foo)
>>> foo
'This is a sentence'
>>>